It said in big letters when you go to download it "DOWNLOAD DAYZ (ALPHA TEST)". Not really in the fine print, in fact, it's pretty evident from everywhere that it's in alpha.
Glad leg breaking is getting looked at. Hopefully there'll be a fix for the killer trees at some point. I was standing near a tree and my character glitched out, appeared inside the tree and then had his legs broken.
Practically confirmed they will add melee with this tweet:
Also, Rocket adds to it on Reddit: http://www.reddit.com/r/dayz/comments/v7yo0/sign_that_melee_is_coming_for_dayz/c524fnl Looks like we're getting melee combat in some form or another.